package com.leyou.common.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;
import java.util.Map;

/**
 * @author: HuYi.Zhang
 * @create: 2018-04-24 17:20
 **/
public class JsonUtils {

    public static final ObjectMapper mapper = new ObjectMapper();

    private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);

    //@Nullable
    public static String toString(Object obj) {
        if (obj == null) {
            return null;
        }
        if (obj.getClass() == String.class) {
            return (String) obj;
        }
        try {
            return mapper.writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            logger.error("json序列化出错：" + obj, e);
            return null;
        }
    }

    //@Nullable
    public static <T> T toBean(String json, Class<T> tClass) {
        try {
            return mapper.readValue(json, tClass);
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    //@Nullable
    public static <E> List<E> toList(String json, Class<E> eClass) {
        try {
            return mapper.readValue(json, mapper.getTypeFactory().constructCollectionType(List.class, eClass));
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    //@Nullable
    public static <K, V> Map<K, V> toMap(String json, Class<K> kClass, Class<V> vClass) {
        try {
            return mapper.readValue(json, mapper.getTypeFactory().constructMapType(Map.class, kClass, vClass));
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    //@Nullable
    public static <T> T nativeRead(String json, TypeReference<T> type) {
        try {
            return mapper.readValue(json, type);
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    @Data
    @NoArgsConstructor
    @AllArgsConstructor
  static   class User{
        String name;
        Integer age;


    }
    public static void main(String[] args) {
//        User user = new User("jie",21);
//        String json = toString(user);
//        System.out.println(json);
//        User user1 = toBean(json, User.class);
//        System.out.println(user1);
//        json="[10,15,2]";
//        List<Integer> integers = toList(json, Integer.class);
//        System.out.println(integers);
//        String json="{\n" +
//                "  \"name\":\"jie\",\n" +
//                "  \"age\":11\n" +
//                "}";
//        Map<String, String> map = toMap(json, String.class, String.class);
//        System.out.println(map);
        //language=JSON
//        String json="[{\n" +
//                "  \"name\":\"jie\",\n" +
//                "  \"age\":32\n" +
//                " },{\n" +
//                "  \"name\":\"jie1\",\n" +
//                "  \"age\":312\n" +
//                "}]";
//        List<Map<String, String>> maps = nativeRead(json, new TypeReference<List<Map<String, String>>>() {
//        });
//        for (Map<String, String> map : maps) {
//            System.out.println(map);
//        }
        try {
            InetAddress a=InetAddress.getLocalHost();
            System.out.println(a.getHostAddress());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }


    }
}
